HTACCESS and ROBOTS For Root Blog and Subdomain Blogs (2 posts)

I have the same .HTACCESS and ROBOTS.txt file in each directory. Root and all subdomains.
Recently I have been getting lower traffic at my blogs so I was wondering if I made a mistake somewhere.
Is there anything wrong with these and does it look ok?

# If requested resource does not exist as a file
RewriteCond %{REQUEST_FILENAME} !-f
# and does not end with a period followed by a filetype
RewriteCond %{REQUEST_URI} !..+$
# and does not end with a slash
RewriteCond %{REQUEST_URI} !/$
# then add a trailing slash and redirect
RewriteRule (.*) $1/ [R=301,L]